Well-drill.



R1 L. WOODARD,

WELL'DRHL APPLICAUON HLED OCI'. 23

3 SHELTSWS'HE M f lfd Inventor,

ff@ ,gli Fl a i3 M R. L. WOODARD.

WELL DRILL.

APPLICANON man oc1.29,1914.

Attorneys.

Inventorj l Witnesses STATES PATENT Ormes."

ROY L. TODALRD,` 0F FULLEBTON, CALIFORNIA. i

WELL -DB-ILL.

t'vpe used informing oil yells andthe like.

(lne of the objects 'of the present invention is to provide a drill'which is detach ably `mounted within the Well pipe or tube,

said tub'e being utilized for thepurposcof rotating the drill and being left in the v vell after the completion of the drillingopera tion, it being,r possible'to "remo-'ve the drill from said tn be whenever it is desired `to sharpen it or whenever the drilling` operationv is completed. Y A' further object is to providenovel means .for coupling or locking the (lr-ill tovthe 4Well tube 'so that ponierfinay 'be prfoperlytrans-Y niittejd vfrom the tube tof-'lie 4drill during'tli'e' formation'of/the well, additional means being' employee` for unlocking :thegdrill from the tube ufheuevervit is desiredto remove proceeds1 the inven ion resides in the ombination'and arrangement of parts vand 1n the ,said drin.

further object isftoproi'jide a novel forrii otgripping tool for engaging the drill, -So

as to. unlo'cl ',it and for Wlithlravr'ingsaid` drill 'when unlocked, the same t' olr being also employed for lowering the dri l. into the tube and depositingit therein after it-,has been locked thereto. Y l

.\V ith the foregoing and'other objects in view which willa pear `as the description details of construction hereinafter described and claimed. it being understood that changes. in' the precise embodiment'of the invention herein disclosed, can be made within thescope of what is claimed, without departing from' the spirit of theinvention..

ferred form of the invention has been shown.

In said drawings; Figure l'is a central vertical longitudinal section through the drill and thel ivell tube couple thereto,r the 'manipulating tool being show v in engageT meut with tht-shank of the drill prior to the unlocking and elevating of tlledrill rela'- iw to llu tillw.. l"ij f.

,with 'said boit. "Figgi's 'is 1a. 'seccion 'and 21.

is@ View similar Specicatlon'of Letters-Patent. A Patented Slept. 1916.- l. I I. .v I i l i. l Application filed October 29, 1914. 'Serial 110.869.284.-

to Fig; 1 but showing'the drill and its m21-- ulpulating tool in eleimtiorr.. `4 Fig..3 is'. an

Venlarged'section Online 1. Fig,

Fig. 13 isa front elevation thereof; Fig

14 is a perspective view -ofo'nev of tlfefbo'ltsf controlled vby-said 'slidesj Fig 4 1'5v isV a" ver;- tical longitudinal section through'the lowerend portion of the'well tubega portionjof the drin being'shown in positron: chewing! and invsection. Fig.,16is a perspective- View 1 g-tlie 7 5 "o ssfr rig. 1a.Y Fig-2o isf-m1 enafelvmon. of the'bolt shown 'in Fig. 18. Fig .221vis 11- viewv similar to' Fig. 18;ind showingf'gnother ohefof the bolts on said drillfhxixidlingytool and the slicleemployed in connection'fwthf shown. Fig. 29. is a longitudinalseotion through the `'shifting strip used in .connecj 9.0` tion with the slidesshowijr in igsz-L?, 18f4 Fig. .23A is n face view .of zsziidhit-A ing'strip'. Fig. 24 is'a section on line U-TV Fig. 3. :Fig.125 is a section on line Fi .3. Y 1 1 95 eferringrto the figures bycharactersof reference 1 designates u, `well5tiibe rnedeup .f

f .two thicknesses -ofs pipe fittingffsnixgly-A one' InA the accompanying .drawings theprebeing beveled and disposed in". alinement so as thuis to produce a flare as shownatf (entering plates -l are secured tothe inner g face of the tube at its lower end` each of. these plates haring \\edges|::u 1ed upper 'ssl ends as shown at and said plate beingpref erably regularly spacedw'In practice four of them are used, although it is to be understood that any desired number may be em- 5 ployed.

spaced 4intervals are superposed annular series of apertures 6. these apertures being y preferably rectangular and the .correspondf ingapertures ofthe several series being disposed 4in vertical alinement. In practice four of these openings are provided in each.v

series although it is to be understood that agreater or less number may be employed referred.

he tube thus far described constitutes the well tube and is adapted to be rotated inany suitable manner .for the purpose of vrotating a cutter, the tube following the Y2u cutter into the ground and being left therein after the completion of the well. In order Vthat this procedure may be followed and -the cutter or drill removed from the tube whenever it is desired to sharpen the drill, without the necessity of removing the tube from` vthe well, it is necessary to provide a drill of novel form for use within the tube.

- By referring to the drawings, it will be seen that the drill includes a cylindrical 80 body 7 having a central longitudinal bore 8 extending throughout the length thereof,

the upper end portion of thc body being re- .duced annularly as at 9 so as to projectI through a packing ring 10' and being fur- 36 ther reduced at its extremity, as shown at 11 where screw threads are provided.' The packing ring 10 which may be formed of rubber or any yother suitable material is interposed between a lower ring 12 and anv el upper ring 13, this upper ring being provided' with upstanding screws 14 which bear against the lower end of a cap 15. Said cap is I.fitted tightly against the upper end ofv the Abody 7 and l held against rotation rela- 46 tive td the body in any suitable manner. as by, means of one or more' screws 16. The external diameter -of the cap 15 is the same as that of the largest portion of the bodyy 7, said diameter being a shade less than the internal diameter of the tube 1.

The cap 15 has a central rectangular opening 17 and communicating with this opening at opposite sides thereof are radial pasl sages 18 in each of which is slidably mount- Y y 66 ed a bolt 19 having |`a reduced head 20 at itsmount-ed within apertures 28 in the top of the, cap. Thus it will be-seen that when each lever is shifted so as to moye'` the bolt 19 inwardly within the passage 18` the said .lever `will shift the bolt 27 downwardly to Formed within the tube at regularly]l position back of the bolt 19, as shown in Fig. 1, thus securely fastening the bolt 19 in its inwardly projected position. However, when the inwardly extending arm 2.5 of each lever is pushed downwardly, the saidlever will be actuated to first elevate the bolt 27 and to then shift the bolt 19 radially out of the opening 17.

Extending longitudinally through the body 7 are water passages 29 registering 'with like passages 30 within the cap A15,

these passages permitting the downflow of water forced into'the tube 1. 4Return flow of the water within the tube is 'prevented by the'packing 10 whichlis expanded by upward movement of ring 12 causedby the outward movement of the inclined heads 33. As the water cannot return within the tube 1, it must necessarily flow upwardly around said tube and will thus keep the soil away from the tube to enable the tube to be rotated readily during the actuation of the drill.

Formed within the body' 1V at distances apart equal to the distances between the super-posed series of openings 6, are radial passages 31 designed, when the body is properly positioned within the tube 1, to register with the openings l6. In each of these passages 31 is slidably mounted a bolt such asshown in detail in Fig. 14.Y This bolt includes a cylindrical portion 32 from which extends a rectangular head 35.4 A fiat reetangular 'stem 34 extends in the opposite direction from the cylindrical portion 32 and is provided with a rear enlargement 36. These bolts are so proportioned. that, when they are projected outwardly, the cylindrical portion 32' will come against the inner surface of the tube 1 while heads 35 will depressions being regularly spaced and de- ,v

signed, during the,lowering of the botly 7 into the tube 1'to engage the centering plates l4 so that the upwardly converging walls of the depressions will straddle the wedge-shaped upper ends 5 of the plates 4. Thus, should the body 7 be out of its proper position when lowered, the)A ngagement of 0 the walls of vdepressions 37 ith the upper l inclined faces 'of the plates 4 will result in openings 6 ,so that the heads 35 of the bolts will be free to enter the openings. These 'plates 4 engaged by the walls of depressions 37, also act as stops to limit the downward movement of the body 7 Within vthe tube 1-.

Radially disposed passages 38 are formed in the body A7 at diametrically opposed points and below the lower bolt 32, each of these passages jbeing provided vwith a slidable bolt- 39, one of which has been shown in detail in Fig. 16. vThis bolt includes a cylindrical portion40 having a slot 41 ,ex-

tending therethroughwhile projecting from` the inner end of the bolt is a head` 42.

`W'jhen the-bolt is in its innermost position,

the head thereof is projected into'the bore 8 in body 1, whereas, when the said bolts are shifted outwardly, the heads 42 are withdrawn from the bore 8. Each of the passages 38 has agroove 43 tending upwardly, and downwardly thereri-on and within the outer face of the body 7. In'the upper portion of each groove is mounted a slide 44 having an obliquely disposed slot 45 extend ing thereintofrom its outer face and in-` clinedl upwardly and inwardly, that portion of the slide located l'at the inner end-.of the slot 45 being adapted to work within the slot 41 in bolt Thus it will be` seen that when the'slidel 44"' is shifted upwardly, the lower inclined wall of the slot45 will cause the bolt'40 to slide outwardly away from the bore 8 whereas, when the 'slide 44 is moved downwardly, the upper inclined wall of its slot 45 will'push against bolt 39 so a's to foree-the head42 inwardly into the bore 8. A spring-46 bears downwardly `on each slide 4.4 thus to cause the slide to move downwardly automatically when released.

Located in each groove 43 and below the slide 44 is a shifting strip 47 having a longitudinal slot 48 in which is mounted a guide stud '49. The 'lowerend ofl the shifting strip 47 normally projects into the upper portion of one of the depressions 37. Consequently, when body 7 Ais lowered V onto the stop plates 4, certain of these plates will be engaged by the lower ends of the strips 47 and said strips will be shifted upwardly until the walls of the depressions 37 come against the stop plates 4. This upward moremcnt of the strips 47 will result, obviously, in the elet-'ation of the slides 44 and the shifting of the bolts 39 out of the bore 8.

(luide grooves 50 are formed within the lower end of the body 7 andare radially disposed. Preferably four of these grooves are em|':lr. ye.l and the walls ofcach groove hare guide ribs 51 thereon.vv These ribsaic designed to project into corresponding grooves 5; formed in the sides of ruttiiig lades .':3 uach are slidahlj,Y mounten within'the grooves 50 so as to move radially* within the body 7. Each blade 53 has its outer end thickened-,as shown at 54 and thisv thickened portion is beveled at therbottomv 'as shownat 55 inlFig.` 2,v thus to produce'an fdidvancing or cutting edge 56. Each of the cutting blades has an outer inclined shoulder 57 designed to engage th flared lower end of the tube 1 while the blade is in use and also has its upper inner corner cut away to form aninclinedshoulder 58 which, when blade 53 iciin use, extends inwardly a.- short ldistance under thev bore 8.

Slidabily mounted within the opening 17.

in cap -15 is a shank or core 59 preferably rectangular in cross section and which .core extends vlongitudinally through the bore .8.Y A ring 60 is secured to the core 59y and is adapted, to slide4 within and fit snugly against 'the wall' of the lower portion of; bore 8, this ring 60` being secured onthe core in any desired manner, as by means of screws 61. The core projects downwardlyjbelow the. ring'GO and between the cutting blades 53 and is provided, i'nv itslower end, with radially disposed drilling blades 62. Itis to be .understood that whenthe core is in its 'lowerrnost position, the ring 60 bears against the shoulders 58 of the cutters 53 and shi fts said cutters outwardly against. vthe inner surface of. thet i tube 1 with their beveled shouldersf'? under the flared portion of the'ltube 1i.- 'At the'same timel the inner verticalvedges oflthezcutter's 53 engage or practically yengage therespe v tive faces/of theeore 5 9, the blades 62 being shown particularly in Fig. 11.A QObvioSliyl` inwardly when thus held. When the core 59 is in its. lowermost .position, asrdescribefhthe heads 20 o ffboltis hereinbefore referred to, are seated within core 5,9 will prevent blade 53 from 'i Formed longitudinally within eachlfiice of the core 59 is a channel V64, each channel having its lower end located close t'otl-ije ring 60 while its upper end isnormally` spaced from the cap 15 a distance equal to or greater than the distance between the,4`

ring (l0 and the lower end of the 'oo re'f). These cliannr ls 64 are located directly hack of and in communication with lthe respective series ofY vertically alining passages 31. Fixedly mounted along each of the channels 6l a re parallel side strips 65 between which are mounted three sets of deflecting devices, 'one set being provided'forieach ofthebolts 32 adjacentthereto. The sets are superposed and each o'f them incl'udes'an upper block 661the ,lower end of whichis inclinedV downwardly and inwardly as shown' at .(37. llrider this block, which extends from one v 10o disposed between the cutting blades-553,' as

side strip 65 to the other, are arranged spaced deflecting plates 68 secured to the side strips 65 and having their upper edges spaced from but parallel with the lower face 67 yof the block 66 thereabove. The blocks 66 and the plates 68 project into the channels 64 as shown particularly in Fig. 1, the side strips 65 bearing against the outer face of the core 59 and extendin close to the wall of -the bore 8. It will be noted that the upper or outer ends of the inclined faces of the blocks 66 are cut away, as at 69 so that the outer angles or points of the plates 68tl1us project outwardly beyond the outer ends of the inclined faces 67. Furthermore, it will be noted that inner or lower angles or points of the blocks 66 project beyond the inner edges of the plates 68. This will be apparent by referring to Fig. 12.

The blocks 66 are so positioned that when the core 59 is in its lowermost position, as shown in Fig. 1, the Aenlargedinner ends 36 of the bolts 32 will rest within the cut-away portions 69. When, however, the Acore 59 is elevated within the body 7, thus carrying the strips 65, blocks 66 and plates G8 therewith, the upper corners of the plates 68 will engage the enlargements 36. the Shanks 34 being received between the plates 68.

This movement will result in the retraction.

of the heads 35 of the boltsV from the` openings 6, the enlargements 36 moving inwardly to positions within the channels 64 and back of the lower 'portions of the plates 68. `When,

however, the core 59 is moved downwardly within the body 7, carrying the blocks 66 and the plates 68 therewith, the beveled lower'faces 67 of the blocks 66 will wedge ba'ck of the enlargements 36 and thus cause the bolts to be projected and the heads 35 to become-seated within the openings 6.

Extending upwardly from the tore 59 is a stem 70 having a threaded portion 71.

This stem is adapted to be engaged by a yhandling tool of novel form which will now be described. Connected to a tube or rod Y72 of any desired length is av coupling member 73 having an elongated socket 74 extending thereinto `lirom its lower end. The

lower portion of the socket is reduced to provide an inclined inner shoulder 75. A ring 76 is secured around the coupling member and has depending tongues 77 adapted vto fit within corresponding recesses 78 rformed within the upper edgeportion of a -shiftable .ring 79. This shiftable ring eX- tends around the coupling member and has a. dared lower end as shownat ,80, which, `when ,the vvenirne@ 77 are seated in recesses 78, is s'upp'orted above the lower end o f the socket member 73. However, by lowering the ring 79 4and then turning it so as -to bring the tongues 77 out of recesses 78 and in en agement with the'upper edgepf the ring 9, the lower flared portion 80 of slid vward movement.

ring 79 will be held at a point below the lower end of the coupling member 73. Slidably mounted within the socket 74is a block 81 provided with longitudinal grooves 82 in its periphery` these grooves being preferably regularly spaced. Secured within each of the grooves is a resilient arm 83 the inner or active face of which is threaded so as to grip securely the threaded portion 71 of the stem 70. The lower ends of thejaws are 7 sages 85 are bolts 87 and additional bolts 88 are slidably mounted within the passages 86. The bolts 87 and 88 are of the same construction, each having a longitudinal slot 89. Bolts 87 are adapted to be actuated by slides 90 mounted within grooves 9.1 formed in the outer face of the coupling member 73, these slides 90 being similar to the slides 44 hereinbefore described and being extended through the slots 89. Springs 91 bear down-J wardly on the slides and serve to hold them normally Vpressed downwardly upon the bolts 87 while said bolts are projected to positions within the sockets 74 and under 100 the block 81, thus to support the said block in elevated position and against the action of the compressed spring 85'. The bolts 88 are engaged by slides 92 similarly mounted in the outer face of the coupling member 73,

these slides, however, being formed with diagonally disposed slots 93 inclined oppositely to the slotsin the slides 90 so that the triangular nose 94 provided above each slot projects downwardly into the slot 89 in the 1160 bolt 88. See Fig. 21.

Slidably mounted under each ofthe slides 90 is a shifting strip v95 projecting below the coupling member 73 and another shiftingstrip 96 is slidably mounted under each 115 of the slides 92 but these strips 96 do not project downwardly as far as do the Strips It might be stated that the bolts 88 are so positioned as to extend 'over the block 81 when-saidblock is in its lowermost po- 12o siton,'thus holding the block against up- A spring 97 is, provided above each` of the slides92, and operates tov effect a quick return or downward -movement of the slide 92 during the downward 125 movement of its shifting strip 96." A

Assuming that the drill is locked within' the lower pition of the tube 1 as shown ink Fig. 1 and it is desired to. remove the drill for the purpose of sharpening: the 13a ring 79 being positioned as illustrated in Figs. 1 and 2. .Vheh the coupling member 73 is lowered .a desired distance, the stem .is received within the lower portion of the socket 74 and, as the coupling member 73 continues to descend, the shifting strips 95 come luto Contact with cap 15 and are thus held against downward movement during the continued downward movement of the coupling member 73.' This results in relative movement of the slides 9() and bolt/s 87 with the result that.the said bolts are retracted from under blocs 81 and said block is shifted downwardly within socket 74 under the action of spring This causes the lower beveled ends of thel jaws 84 to come into contact with the shoulder 75 with the result that said "uws are deflected inwardly so as to grip t e threaded portion '71 of stem 70. Immediately subsequent to the releae of the block 81 in the manner described, the other shifting strips 96 come into contact with the, cap 15 and are shifted. This results in the projection of the bolts 88 inwardly to position over the block 81 so that the lock is thus held against upward movement and the jaws 84 are secured in engagement with the threaded portion 71. Durin this operation the lower end of the coup in member 73 strikes the inner arms 25 of t e T-levers, thus causing the bolts 27 t0 be raised from positions back of the bolts19 and said bolts 19t0 be shifted radially so as to withdraw their heads 20 from the sockets 63. As the bolts areshifted horizontally, they will obviously remain in any position to which they may be moved. Consequently 'when the coupling y member is pulled upwardly with the jaws 84 ipping the stem 70, said stem as well 'as t e core 59 will likewise be movedupwardly. During the first portion of the upward movement of the core, the plates 68 engage the enlarged innen ends 36 of the bolts 32 and withdraw the bolts from the openings 6 inthe manuel' hereinbefore described. At the same time the ring 6() is moved upwardly past the retracted bolts 39. Upon the completion of thl retraction of bolts 32 and as soon as ri g (i0 has passed the bolts 39, the upper ends of the upper blocks 66 come against the cap 15 so that further upward movement of the coupling member 73 will result in the upward movement of the body 7 within the tube 1. As the core 59 has been withdrawn from between the blades 53, it will be apparent that as soon as the body 7 begins to move upwardly, the beveled ,shoulders 57 on the blades 53 will engage the flared lower end 3 of the tube so Vthat the blades will thus be shifted inwardly es under the core 59 and thus be free te to the tube 1.

travel upwardly within the tube 1 with the body 7. v

After the blades have been sharpened and it is desired to reinsert the drill within the tube 1 so as t0 continue the drilling operation, the ring 79 is lowered relative to ring 76 and turned so as to bring its flared lower end 8() below the lower end of the coupling member 73. After this adjustment has been effected, the body 7, which is suspended from the core 59 in the manner described, is lowered, jaws 84 still gripping the threaded portion 71 of stem 70. As the body moves downwardly within the tube 1, the depressions 37 receive the centering plates -l and the blades 53 downwardly beyond the open end of t e tube 1. Just prior to the completion of the seating of the body on the centering plates 4, certain of said plates engage the shifting strips 47 and the bolts 39 which have been automatically projected by spring pressed slides 44 into position under the ring 60, are thus retracted from under the ring 60. Consequently, the core 59 can thenmove downwardly independently of the body 7 and will enter between the inner edges (if the blades 53. The engagement of the body with the plates 4 operates, as be- .ore described, to bring thepassages 31 into alinement with the openings 6, so that, during this downward movement of core 5*.) relative to body 7, the blocks 156 will operate to project the bolts 32 outwardly into the openings 6, thereby' locking the body-7 As the core reaches the limit of its downward movement, the ring;r 79 strikes the arms 26 of the T-levers thus shifting said levels so as to throw the bolts 19 inwardly into engagement with the sockets 63, after which the bolts 27 ass-'unie positions back of the bolts 19 and lock them in engagin positions.

It will Ee noted that the upper bolts Y 32-33 are formed with beveled upper 4faces so that when these bolts are projected, they work against the bottom of the ring 12 and shift said ring upwardly, thus to compress the packing as hereinbefore stated.

What is claimed i.cl

1. The combination with a revoluble apertured casing, ol a core, a body carried by and movable relative to the core, cutting elements carried by the body, and means operated by the relative movement of theV core and body for locking the body to and unlocking it from the tubular casing, said revoluble casing constituting means for driving the cutting element when the body is locked to the casing.

2: The combination with a revoluble well casm a. core, and a body supported by and mova le relative to the core and insertible into the casing, of cutting elements carried by the body, means operated by the relative movement of the core and body for locking 3. The combination with a tube, of a ooie,

said body to or unlocking it from the casing, and means operated by the movement of the core in one direction relative to the body for projecting the cutting elements beyond rthe end of the casing and radially beyond the wall of the easing.

a body mounted thereon and movable relative thereto, a cutting element carried by the body, means operated by the relative movement of the core and body for locking the bod to or unlockingit from the tube, means or securing the core against movement relative to the tube, core gripping means, and means movable with said core gripping means for unlocking the body from the core. v

4. The combination with atube, of a body insertible thereinto. radially mgvable cutters carried by the body, a core onnectcd to and shit'table longitudinally within the body, said core, when in one position, constitutin means for spacing' the cutters, means ir locking the core against movement relative to the body, separate means fog' successively gripping the core and unlocking the same from the body, and means operated by the movement of the core relative to the body for locking said body to or unlocking it from the tube.

5. The combination with a tube, of a core, a cutting element at one end of the core, a body movably mounted on the core, euttin elements carried by the body, means for locking the body within the tube, means for locking the core against movement within the body, and means for successively unlocking the core from the body, shifting the core relative to the body, thereby to simultaneousl withdraw the core'from between the cuttlng elements on the body and unlock thobody from the tube, and for velevating the body within the tube, said tube constituting means for shifting the cutting elements inwardly on the ody during such upward movement of th body.

6. The combination with a revoluble tube havin apertures, of a body insertible into the tu e, radially movable bolts within the body, a core within and/movable relative to the body, cooperating means upon the body and tube for shifting the bolts into register with the openings in the tube, and means operated by the relative movement of the body and core for shifting the bolts into thek apertures, said bolts when seated in the apertures constituting means for transmitting motion from the tube to the body.

'i'.` The combination with an apertured tube, ot' a body insertible thereinto and having end depressions in the periphery thereof, radially movable bolts carried by the body, centering means within the tube and `coperating with the-Walls of the depressions for shifting the body to position the bolts in register with the apertures, a core movably mounted within the body, means` for holding the core against downward movement withinfthe body, means upon the body and coperating with the v'centering means for releasing the core, and means operated by the movement of the released core relative to the body for projecting the bolts into the apertures. v

8. The combination with an apegtured tube, of a tubular body insertible thereinto, radially movable bolts carried by-the body, cutting elements connected to the body, a core slidable within the body and shiftable in one direction to project the bolts into the apertured tube and to project the cutting elements radially relative to the body, means for Locking the core against movement relative to the body subsequent to projection of the bolts and cutting elements, means for unlocking the core from the body, and means for gripping the core to move it longitudinally of the body.

9. The combination with an apertured tube, of a tubular body insertible thereinto, cutting elements slidable radially within one end portion of the body, a slidable core within the body and coperating with the cutting elements to project said elements radially relative to the body when th core is moved in one direction within the body, and means operated by the core when moved in said direction for locking the body to the apertured tube.

10.*'l`he corribination with ztube, a tubular body insertible tbereinto, a core slidably mounted within the body, and lmeans operated by the movement of the core relative to the body for locking the body to and unlocking it from the tube, of means for locking the body to the core, a coupling member having-a socket for the reception of a portion of the core, gripping elements movalilyy mounted within the socket, means upon the coupling member and ciiperating with the body for locking the gripping elements in engagement with the core, and cooperating means upon the coupling member and body for unlocking the core from the body subsequently to the couliling of the core to the said coupling member.

11. The combination with a tube a lmdy insertible tliereinto and having water pas-- sages extending.r tberetbrouofb.,A and a core mounted for movement within the body, of cutting elements movable radially upon the. bottom ot tbe body. said core vconstitilting means, when moved in one direction, 'for shifting said cuttingr elements radially and for spacing said elements, means operated b v the core when moved in said direction for locking thc body to the tube, means for lock'- ing the core against movement relative tothe body subsequent to such movement, and means for successively unlocking the core lli? from the body, shifting the core relative to the body to release the cutting elements and unlock the body, and for lifting the body within the tube.

l2. The combination with a drill including a core having a threaded stem, of a coupling member having a stem. receiving socket, movably supported threaded jaws within the socket, means for locking the jaws in elevated positions within the socket, cooperating means upon the drill and socket for releasing the jaws when the stem is p0- sitioned therebetween, means for automatically shifting the released jaws, means for automatically deflecting 4the released jaws toward each other to bind upon the stem, and means for automatically locking the jaws in engagement with the stein.

In testimony that I claim the foregoing as my own, I have hereto aixed my signature in the presence of two witnesses.

y ROY L. WOODARD.

Vtnesses:

CARL SCnUMACHnn,

JULIA L. SCHUMACHER. 

